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Title: Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station
Authors: Kataoka, Ryuho
Nishiyama, Takanori
Tanaka, Yoshimasa
Kadokura, Akira
Uchida, Herbert Akihito
Ebihara, Yusuke
Ejiri, Mitsumu K.
Tomikawa, Yoshihiro
Tsutsumi, Masaki
Sato, Kaoru
Miyoshi, Yoshizumi
Shiokawa, Kazuo
Kurita, Satoshi  kyouindb  KAKEN_id  orcid (unconfirmed)
Kasahara, Yoshiya
Ozaki, Mitsunori
Hosokawa, Keisuke
Matsuda, Shoya
Shinohara, Iku
Takashima, Takeshi
Sato, Tatsuhiko
Mitani, Takefumi
Hori, Tomoaki
Higashio, Nana
Author's alias: 片岡, 龍峰
西山, 尚典
田中, 良昌
門倉, 昭
内田, ヘルベルト 陽仁
海老原, 祐輔
江尻, 省
冨川, 喜弘
堤, 雅基
佐藤, 薫
三好, 由好
塩川, 和夫
栗田, 怜
笠原, 禎也
尾崎, 光紀
細川, 敬祐
松田, 昇也
篠原, 育
高島, 健
佐藤, 達彦
三谷, 烈史
堀, 智昭
東尾, 奈々
Keywords: Aurora
Energetic electrons
Issue Date: 23-Jan-2019
Publisher: Springer Nature
Journal title: Earth, Planets and Space
Volume: 71
Thesis number: 9
Abstract: Transient mesospheric echo in the VHF range was detected at an altitude of 65–70 km during the auroral breakup that occurred from 2220 to 2226 UT on June 30, 2017. During this event, the footprint of the Arase satellite was located within the field of view of the all-sky imagers at Syowa Station in the Antarctic. Auroral observations at Syowa Station revealed the dominant precipitation of relatively soft electrons during the auroral breakup. A corresponding spike in cosmic noise absorption was also observed at Syowa Station, while the Arase satellite observed a flux enhancement of > 100 keV electrons and a broadband noise without detecting chorus waves or electromagnetic ion cyclotron waves. A general-purpose Monte Carlo particle transport simulation code was used to quantitatively evaluate the ionization in the middle atmosphere. Results of this study indicate that the precipitation of energetic electrons of > 100 keV, rather than X-rays from the auroral electrons, played a dominant role in the transient and deep (65–70 km) mesospheric ionization during the observed auroral breakup.
Description: オーロラが爆発するとヴァン・アレン帯の電子が上空65 kmにまで侵入することを解明. 京都大学プレスリリース. 2019-02-12.
Rights: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
DOI(Published Version): 10.1186/s40623-019-0989-7
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